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Shrink table of contents header 

We aren't gonna need 2^32 uids/gids, this is a package manager, not a
file system. Also, mode only uses 16 of 32 bits. We can shrink the
entire header to 8 bytes.

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>
This commit is contained in:
David Oberhollenzer 2019-04-28 21:16:47 +02:00
parent f95f02f6be
commit ab753a402f
2 changed files with 5 additions and 12 deletions
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10
doc/fileformat.md
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@ -105,14 +105,10 @@ table of contents contains an entry with the following common structure:
0 1 2 3 0 1 2 3
+-------+-------+-------+-------+ +-------+-------+-------+-------+
0 | mode | 0 | mode | user id |
+-------+-------+-------+-------+ +-------+-------+-------+-------+
1 | user id | 1 | group id | path length |
+-------+-------+-------+-------+ +-------+-------+-------+-------+
2 | group id |
+-------+-------+-------+-------+
3 | path length |
+---------------+
The mode field contains standard UNIX permissions. The user ID and group ID The mode field contains standard UNIX permissions. The user ID and group ID
fields contain the numeric IDs of the user and group respectively that own fields contain the numeric IDs of the user and group respectively that own
@ -142,8 +138,6 @@ On the bit level, the mode field is structured as follows:
| +------------------------- set UID bit | +------------------------- set UID bit
+----------------------------- file type +----------------------------- file type
The upper 16 bit of the mode filed must be set to zero.
Currently, the following file types are supported: Currently, the following file types are supported:
* `S_IFCHR` with a value of 2. The entry defines a character device. * `S_IFCHR` with a value of 2. The entry defines a character device.

7
include/pkg/pkgformat.h
View File

@ -36,10 +36,9 @@ typedef struct {
} record_t; } record_t;
typedef struct { typedef struct {
uint32_t mode; uint16_t mode;
uint32_t uid; uint16_t uid;
uint32_t gid; uint16_t gid;
uint16_t path_length; uint16_t path_length;
/* uint8_t path[]; */ /* uint8_t path[]; */
} toc_entry_t; } toc_entry_t;